A. After the business is migrated to the cloud, in order to facilitate maintenance, the operation and maintenance personnel open ports 22 and 3389 for each host, so that the operation and maintenance work can be performed anywhere, regardless of geographical restrictions, and the work efficiency is higher

B. Take advantage of the characteristics of diverse services and flexible resources on the cloud, select appropriate specifications, and deploy the web terminal and applications on the same virtual host. Middleware and databases are deployed using cloud services provided by the cloud platform

C. Based on the perspective of convenient architecture and maintenance, directly follow the offline mode to purchase 5 bare metal servers on the cloud for deployment business

D. Sort out the open ports of the offline business system, set up an appropriate security group according to the guidance on the cloud, and open the required ports for each business module.